Effects of High Performance Mineral Admixtures on Performance of High Strength Manufactured-Sand Concrete

Abstract

Abstract: To analyze the influence law of S105 mineral powder and other mineral admixtures on workability, compressive strength, and drying shrinkage of C80 high strength manufactured-sand concrete quantitatively, the slump, expansion, compressive strength, and drying shrinkage of high strength manufactured-sand concrete at different ages (3 d, 7 d, 28 d, 60 d) were measured. The raw material in the experiment was the mixture of concrete raw material and S105 mineral powder, or the mixture of concrete raw material, S105 mineral powder and mineral admixtures. In the second case, the cement was replaced by microspheres, ultrafine mineral powder or micro-silica with different dosages, respectively. Then, the variation trend of the performance of high strength manufactured-sand concrete was analyzed by the corresponding charts and the actual state of concrete mixture. The result shows that the workability and compressive strength of high strength manufactured-sand concrete are improved, and the drying shrinkage is reduced significantly by adding mineral admixtures in a certain dosage range. Compared with the single mixing of S105 mineral powder, the mixing of S105 mineral powder and different mineral admixtures significantly improve the comprehensive performance of concrete. Meanwhile, the concrete maintains good workability. Considering the influence of workability, strength, and drying shrinkage, when the cement mass dosage replaced by ultrafine mineral powder is 3%, that is, the mass ratio of cement, S105 mineral powder, and ultrafine mineral powder is 33:11:1, the performance of high strength manufactured-sand concrete is at a good level. In this case, the cohesion and fluidity of concrete are significantly improved, the 3 d and 60 d compressive strength increases by 3.1% and 5.1%, respectively, and the drying shrinkage rate decreases by 4.0%.

Key words: manufactured-sand concrete, S105 mineral powder, mineral admixture, working performance, compressive strength, drying shrinkage rate

CLC Number:

TU528

DUAN Chenggang, SUN Yongtao. Effects of High Performance Mineral Admixtures on Performance of High Strength Manufactured-Sand Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2296-2305.

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